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External combustion engine

"External combustion" redirects here. For the album, see External Combustion.
Model Stirling engine, with external heat from a spirit lamp (bottom right) applied to the outside of the glass displacer cylinder.
Newcomen's engine, a precursor of the steam engine, with the boiler heated from beneath
Sectioned steam locomotive. Although the fire is within an enclosed firebox, this is still an external combustion engine, as the exhaust gas and the steam working fluid are kept separate.
Part of a series on
Aircraft propulsion
Shaft engines:
driving propellers, rotors, ducted fans or propfans
Reaction engines

An external combustion engine (EC engine) is a reciprocating heat engine where a working fluid, contained internally, is heated by combustion in an external source, through the engine wall or a heat exchanger. The fluid then, by expanding and acting on the mechanism of the engine, produces motion and usable work.[1] The fluid is then dumped (open cycle), or cooled, compressed and reused (closed cycle). In these types of engines, the combustion is primarily used as a heat source, and the engine can work equally well with other types of heat sources.

  1. ^ external combustion - Definition from the Merriam-Webster Online Dictionary

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